Research On Watermarking Technology Of Relational Database

Relational database watermarking technology is a very worthy research direction.At present,as a digital resource with economic value,data information is very easy to be copied and spread,so the copyright protection of data is very important.Taking the copyright protection of relational databases as the breakthrough point,the paper proposes a bit-hiding minimizing relational database watermarking scheme based on bit hiding and a zero distortion blind reversible relational database watermarking scheme based on primary key,aiming at the shortcomings and deficiencies of the existing relational database watermarking schemes.The main work and contributions of the thesis are as follows:First,this paper proposes a watermarking scheme based on bit hiding to minimize distortion in relational database.This scheme mainly hides the watermark bits by embedding the bits in some attribute values in the data set,and which attribute is selected and which attribute is set secretly by the watermark embedder,so the watermark has strong concealment.Makes the attacker unable to find out the clues related to the watermark,thus ensuring the security of the entire watermark.Experimental analysis shows that the watermarking scheme is robust against insertion attacks,deletion attacks,modification attacks,out-of-sequence attacks,and compound attacks.It can still be completely extracted correctly when the attack range reaches99% of the original data.Watermark.Comparing the experimental results with some existing schemes,it can be seen that this scheme is more robust than other schemes.In addition,this paper proposes a solution to the additional attack for this watermarking scheme.Even if the data set is embedded by the attacker's second watermark,the original watermark can still be extracted correctly and the ownership of the data set can be declared.Second,this paper proposes a zero-distortion blind reversible relational database watermarking scheme based on primary key.The solution uses the primary key in the data set for watermark embedding,so that the non-primary key values in the entire data set will not be modified,thereby ensuring zero distortion of the entire data set,and can be applied to database tables that do not have numeric attributes.The program also adds data integrity verification,which is used to verify whether the data has been tampered with when extracting the watermark.The experimental analysis results show that the watermarking scheme has certain performance advantages,can provide super large watermark capacity,and the watermark embedding speed and watermark extraction speed are also faster than some existing schemes.Like the previous solution,this solution is robust against insertion attacks,deletion attacks,modification attacks,out-of-order attacks,and compound attacks.And this scheme is naturally able to resist additional attacks,and does not require the participation of a trusted third party.